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# Memory.updateThreadResourceId()

The `.updateThreadResourceId()` method transfers ownership of an existing thread to a different resource by reassigning its `resourceId`. It updates the thread and all of its associated messages so that they belong to the new resource, while preserving the thread's original `createdAt` timestamp. This is useful for scenarios such as moving a private thread into a shared workspace.

## Usage example

```typescript
import { Memory } from '@mastra/memory'
import { LibSQLStore } from '@mastra/libsql'

const memory = new Memory({
  storage: new LibSQLStore({ id: 'memory-store', url: 'file:./memory.db' }),
})

const thread = await memory.updateThreadResourceId({
  threadId: 'thread-123',
  resourceId: 'new-resource-456',
})
```

## Parameters

**threadId** (`string`): The ID of the thread to transfer.

**resourceId** (`string`): The resource that should own the thread after the call.

## Returns

**thread** (`StorageThreadType`): The updated thread with the new resourceId. If the thread already belongs to the target resource, it is returned unchanged.

## Behavior

- The thread's `resourceId` is reassigned to the new resource, and all of its messages are updated to reference the new resource.
- The thread's original `createdAt` timestamp is preserved. The `updatedAt` timestamp is refreshed.
- If the thread already belongs to the target resource, the method is a no-op and returns the existing thread.
- If the thread doesn't exist, the method throws an error.

## Security

Thread ownership transfer changes which resource a thread belongs to, bypassing the normal per-resource ownership checks. The HTTP endpoint (`POST /memory/threads/:threadId/transfer`) is only available to privileged, non-resource-scoped callers. Requests made with a resolved resource scope are rejected, and when `server.auth` is configured without an FGA provider the endpoint also rejects unscoped requests rather than treating them as implicitly privileged. Perform transfers from a trusted service context rather than exposing this operation directly to end users.

Like all memory mutations (deleting threads, listing messages, writing working memory), this endpoint is unauthenticated on a server configured with no authentication at all. Configure `server.auth` (and, for per-resource enforcement, an FGA provider) before exposing the memory API to untrusted callers.